CA2220904A1 - A control system for neurosurgical electrosurgical unit - Google Patents

A control system for neurosurgical electrosurgical unit

Info

Publication number
CA2220904A1
CA2220904A1 CA002220904A CA2220904A CA2220904A1 CA 2220904 A1 CA2220904 A1 CA 2220904A1 CA 002220904 A CA002220904 A CA 002220904A CA 2220904 A CA2220904 A CA 2220904A CA 2220904 A1 CA2220904 A1 CA 2220904A1
Authority
CA
Canada
Prior art keywords
impedance
rms
high frequency
source
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002220904A
Other languages
French (fr)
Other versions
CA2220904C (en
Inventor
Jeffrey L. Eggleston
James H. Orszulak
Matthew J. Sodnicar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Covidien AG
Original Assignee
Valleylab, Inc.
Jeffrey L. Eggleston
James H. Orszulak
Matthew J. Sodnicar
Sherwood Services Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valleylab, Inc., Jeffrey L. Eggleston, James H. Orszulak, Matthew J. Sodnicar, Sherwood Services Ag filed Critical Valleylab, Inc.
Publication of CA2220904A1 publication Critical patent/CA2220904A1/en
Application granted granted Critical
Publication of CA2220904C publication Critical patent/CA2220904C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/1206—Generators therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B18/1442—Probes having pivoting end effectors, e.g. forceps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00773—Sensed parameters
    • A61B2018/00875—Resistance or impedance

Abstract

A control system (10) and method for the operation of neurosurgical bipolar electrodes (11) provides a source of high frequency energy (13') connected to bipolar electrodes (11). Contacting surfaces are on the bipolar electrodes (11) of highly electrically conductive material. A current transducer attached to the source of high frequency energy (13') measures (20) the RMS current applied between the contact surfaces (25). A current transducer attached to the source of high frequency energy (13') provides a signal (26) correlated to the instantaneous values of the RMS voltage between the contacts. A control connects to the source of high frequency energy (13') for initially regulating the RMS current applied by the contacting surfaces in response to the impedance until the signal (19) divided by the measure (20) which is representative of the instantaneous impedance of the load reaches a predetermined value. The control regulates the RMS power applied by the contacting surfaces in accord with the impedance until the signal (19) divided by the measure (20) reaches a predefined value. The control responds to the measure (20) and the signal (19) so that the RMS voltage applied to the load being treated between the contacting surfaces regulated while its impedance is monitored until a prescribed value is reached. The control regulates the RMS
voltage applied in accord with the impedance by changing the RMS voltage to a percentage of that applied until the prescribed value is obtained so that the tissues stay moist and are coagulated without drying and carbonizing or turning to eschar.
CA002220904A 1995-06-06 1996-06-03 A control system for neurosurgical electrosurgical unit Expired - Fee Related CA2220904C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/470,533 US5720744A (en) 1995-06-06 1995-06-06 Control system for neurosurgery
US08/470,533 1995-06-06
PCT/IB1996/000547 WO1996039085A1 (en) 1995-06-06 1996-06-03 A control system for neurosurgical electrosurgical unit

Publications (2)

Publication Number Publication Date
CA2220904A1 true CA2220904A1 (en) 1996-12-12
CA2220904C CA2220904C (en) 2001-08-14

Family

ID=23867985

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002220904A Expired - Fee Related CA2220904C (en) 1995-06-06 1996-06-03 A control system for neurosurgical electrosurgical unit

Country Status (5)

Country Link
US (1) US5720744A (en)
JP (1) JP2972349B2 (en)
AU (1) AU5700696A (en)
CA (1) CA2220904C (en)
WO (1) WO1996039085A1 (en)

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AU5700696A (en) 1996-12-24
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CA2220904C (en) 2001-08-14
WO1996039085A1 (en) 1996-12-12
US5720744A (en) 1998-02-24

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